Device for obviating dead-centers



(No Model.)

G. MOSS. DEVICE FOR OB VIATING DEAD CENTERS. No. 55,705.

Patented Jan. 11; 1887.

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UNITED STATES ATENT GILBERT MOSS, THREE OAKS, MICHIGAN.

DEVICE FOR OBVIATING DEAD-CENTERS.

ESPECIE'ICATION forming part of Letterslatent No. 355,705, dated January 11, 1887,

' Application filed March 31, 1886. Serial No. 197,277. (No model.)

To all whom it may concern.-

Be it known that I, GILBERT Moss, a subject of the Queen of Great Britain, residing at Three Oaks, county of Berrien, State of Michigan, have invented a new and useful Mechanical Movement for Obviating Dead-Centers, of which the following is a specification.

This invention consists in a mechanical construction for converting reciprocating motion to rotary motion.

The main object of the invention is to obviate dead-centers.

In the drawings, forming a part of this specification, Figure 1 is a plan View; Fig. 2, a side elevation of Fig. 1; Fig. 3,an enlarged plan of left-hand end ofFig.1; Fig. 4, a section on line 2 2 inFig. 3; and Fig. 5, details of parts in Fig. 2, referred to by like letters, the part P being in section.

Referring to the letters of reference marked on the drawings, P represents the top of a suitable support to the mechanism. At 1' an engine-piston isshow r, having the ordinary slide-bearings, G A. These parts are merely introduced to show a means of power and to illustrate reciprocating motion.

Of course the invention is not confined to any given power. It will be 'found useful in connection with wind-wheels and other power means. The reciprocating rod or piston r is connected with the crank c of the rotatable shaft 0 by means of a pitman composed ofi two parts, a a, said parts being jointedly connected by the pivot e. The end arm, a, of the pitman is at an angle to the main part (6. Just what particular angle is notmaterial, as it depends on the length of parts.

The pivot 6 has guide-bearings in the oblong slot D. The lower end of the pivot 6 may be provided with a roller, :0, to play in the slot D, if preferred or the roller may be dispensed with.

The oblong slot D represents two opposite arcs of a circle joined at the ends. Thus when the pivot 6 gets at the end of one of the arcs it at once goes back to the point of starting by traversing theother are. This guide-slot also acts as a wedge giving power in connection with arm a. At the ends of the guide-slot D are spring-actuated dogs B, so formed that their outer rear corners extendover the slot,

itstransit contacts with the dog B, as at right as at left hand in Fig. 3'. Thus the pivot e in hand in Fig. 3, forcing it out of its plane, and

after passing it said dog is forced back by spring 12(0r equivalent) against stop S, thus closing the path of the pivot 0 against a receding movement of said pivot.

The dotted positions of parts in Fig. 3 show the operation. In some cases dogs may not be needed. Of course if there were any deadcenters the points where they would occur would be at each end of the guideslot, when the pitman a was on a straight line with the piston; but when the pitman a is in this position the end of the crank c of the rotary shaft 0 has been carried by the center by means of the jointed arm a of the pitman proper. So accurately does this movement work that the power required to rotate the shaft 0 is nearly if not precisely the same at whatever point the pivot e may be in the slot D,and the move ment starts just as easily from one position ofrest as from another. Such being the case, there can be nodead-centers. This invention shows that the old rule that an increase in power necessitates an increase in motion will not always hold true.

balance-wheelshould be employed with ratchet and grip.

The device in Fig. 1 is described as a plan view; but it will serve equally well to show a When using the movement in a windmill and the like, a loose side elevation when constructed in this posi- I tion. In short,the invention will work in any position and at any angle. The guide-s1ot here shown consists in a groove in'part'P; but it will appear obvious that an oblong guide- ,way for one end or the other of the pivot eto traverse may be formed of bent bars of metal and in various ways not necessary to illustrate here.

Having thus described my invention, what vI claim as new isman, an arm pivotally connecting with the crank and pitman and at an angle to said pitman, an oblong guideway traversed by the pivot of the arm and pitman, andspring-actuated dogs at the ends: of the guideway,which permit the forward passage of said pivot, but I ends of the arm and reciprocating rod, sub- 10 prevent its receding over the same plane, substantially as set forth. stantially as set forth. "In testimony of the foregoing I have here- 2. A mechanical movement for obviating unto subscribed my name in presence of two 5 deadcenters, comprising, in combination, a I witnesses.

crank-shaft, a reciprocating rod, an arm pivoted t0 the crank and reciprocating rod and at I Witnesses: 4 an angle to said rod, and an oblong guideway JOHN M. PAXsoN, traversed by a projection from the connected GEORGE MAZE.

GILBERT MOSS. 

